Firearm.



PETER MULOOK, OF LEADVILLE, COLORADO.

FIREARNI.

No. 840,085. e

Specification of Letters Patent.

Patented Jan. 1, 1907.

Application filed August 2, 1904. Serial No. 219.209.

To a/ZZ whom, it may concern;

Be it known that I, PETER MULOCK, a citil Zen of the United States, anda resident of Leadville, in the county of Lake and State of Colorado,have invented a new and useful Improvement in Firearms, of which thefollowing is a specification.

My invention relates to an improvement in firearms, and moreparticularly to rifleebores, the object being to prevent gas blow orescape, to provide greater accuracy in the firing, to utilize as far aspossible the full force of the powder, to provide a firearm which willshoot with accuracy for a longer distance than heretofore, to decreasethe trajectory and increase the velocity, and provide a firearm ofincreased life and durability and one which may be cleaned with greaterease than heretofore.

With these objects in view my invention consists in a rifling of uniformdepth throughout the entire length of the bore of a firearm, the entireperiphery of the bore thereof being composed of lands and grooves andhaving one side radial of the bore and the other extending from thebottom of the radial side to the top of the next consecutive land, aswell as in other novel features of construction and combinations ofparts, which will hereinafter be described, and pointed out in theclaims.

In the accompanying drawings, Figure l is a perspective view lookingthrough the bore of the firearm. E ig. 2 is an end view.

A represents the barrel of my improved firearm, having a so-called"twisted7 bore, but in lieu of the ordinary form of bore, in which everyalternate corner is a drone corner, my present invention contemplatesthe omission of these drone corne-rs and the substitution therefor of aconcaved incline, still leaving the ordinary cylindrical or conca-vedintermediate land, which bears closely upon the bullet, as does thecorresponding surface in the bores as now commonly constructed.

Referring now to the drawings, the lands a b are slightly concave, orthey may be said to have a general cylindrical form, and theapproximately V-shaped grooves Z) c have one side radial of the bore andthe other side extending from the bottom of the radial side to the topof the next consecutive land, forming a more or less sharp angle orshoulder between grooves. The bore thus constructed is provided withgrooves of uniform depth throughout its entire length, and the portionsa b of the lands between each groove serve to steady the bullet andcause the displaced lead to become packed thereagainst and to therebyfurther assist in preventing a leakage of gas.

The twist is shown in the drawings aS '0111111 i.

ing from left over to the right; but should the rif-ling be made to turnfrom right over to the left then all of the other parts are reversedcorrespondingly.

From the foregoing it will be seen that the plain concave lands (L b,bearing on the bullet, place more level or flat bearing-surface on themost compressed part of the bullet as it turns through the rifle, and bydispensing with the drone corner hitherto in use it renders cleaningmuch easier, does not permit the bullet to gas-blow, decreases the curveof the trajectory, increases the velocity of the discharged bullet, andis better adapted to the small caliber of firearms than is the presentform of rifling. This style of bore is particularly well adapted forlead bullets, as the corner at c is so formed that it does not lead.

The number of riilings may be varied, but the more used the longer thelife of the rifle is increased, and the more riiiings there are the morelevel or concave fiat bearing-surfaces presented to the bullet. Thesesurfaces are made wider or narrower, according to the size or bore ofthe rifle it is used in.

It is evident that other slight changes might be made in the form andarrangement of the several parts described without departing from thespirit and scope of my invention, and hence I do not wish to limitmyself to the exact constructions herein set forth but,

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. A rifling for firearms extending the entire length of the borethereof and uniform throughout its length, the entire periphery of thebore being composed of lands and approximately V-shaped grooves ofuniform depth throughout the length of the bore, said grooves having oneside radial of the bore and the other side extending from .the bottom ofthe radial side to the top of the next consecutive land, the portions ofthe bore between the grooves serving to steady the bullet and to causethe displaced lead to become packed thereagainst, and thereby furtherprevent a leakage of gas.

2. A riiiing for firearms, extending the entire length of the borethereof and uniform IIO the bore being composed of alternate lands andgrooves, the grooves being approximately V-shaped with one side radialofthe bore and the other side curving from the bottom of the radial sideto the top of the next consecutive land, said grooves of uniform depththroughout the length of the bore and the portions between the groovesserving to steady the bullet and to cause the displaced lead to becomepacked thereagainst and to thereby further prevent a leakage of gas.

3. A riiiing for firearms extending the entire length of the borethereof and uniform throughout its length, the entire periphery of thebore being composed of lands and approximately V-shaped grooves ofuniform throughout its length, the entire periphery of depth throughoutthe length of the bore,

said grooves having one side radial of the bore and the other sideextending from the bottom of the radial side to the top of the nextconsecutive land, said rifling being twisted throughout the length ofthe bore, the portions of the bore between the grooves serving to steadythe bullet and to cause the displaced lead to become packedthereagainst, and thereby further prevent a leakage of gas.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

PETER MULOCK. Witnesses:

F. L. CRETNEY, HENRY A. RUPP.

